Power Electronics and Drives GATE EE Quiz 5

2 years ago .

Here is a quiz to help you prepare for your upcoming GATE 2016 exam. The GATE EE paper has several subjects, each one as important as the last. However, one of the most important subjects in GATE EE is Power Electronics and Drives. The subject is vast, but practice makes tackling it easy.

This quiz contains important questions which match the pattern of the GATE exam. Check your preparation level in every chapter of Power Electronics and Drives for GATE EE by taking the quiz and comparing your ranks. Learn about Power devices, Diode, Thyristor, Power factor and more!

Power Electronics and Drives for GATE EE Quiz 5

Que. 1

Figure (i) shows the circuit diagram of a chopper. The switch s in the circuit in the figure (i) is switched such that the voltage VD across the diode has the waveshape as shown in the figure (ii). The capacitance C is large so that the voltage across it is constant. If the switch s and diode d are ideal

A 1-phase SCR based ac regulator is feeding power to a load consisting of 5 Ω resistance and 16mH inductance. The input supply is 230 V, 50 Hz. The maximum firing angle at which the voltage across the device becomes zero all throughout and the rms value of current through SCR, under the operating condition are

1.

30° and 46 A

2.

30° and 23 A

3.

45° and 23 A

4.

45° and 32 A

Solution

Answer:

Vs = 230 V, 50 Hz

R = 5 Ω, L = 16 mH

The maximum firing angle at which the voltage across the device becomes zero is the angle at which device trigger i.e maximum firing angle to converter